It is the type of pool that combines the most beautiful aesthetic result with the ideal degree of cleaning. In the perimeter overflow, the water line “ends” at the maximum height of the perimeter walls, thus fully integrating the pool of any formation in the surrounding area. At the same time water purification is the most effective as the surface of the pool which collects the most pollutants is renewed immediately and quickly, maintaining clarity and hygiene to the maximum degree. From a functional point of view, it requires the construction of a perimeter canal which will lead the additional overflow water to a smaller tank, the overflow tank.